What is the process called when pus is formed?

The correct term for the process of pus formation is "suppuration." Suppuration occurs as a response to infection, inflammation, or injury, where the body's immune system struggles to eliminate pathogens. During this process, white blood cells, dead tissue, and bacteria accumulate, leading to the formation of pus, which is primarily composed of these substances. Suppuration signifies the body's attempt to fight off an infection and can be indicative of various conditions, including abscesses and other purulent infections.

In contrast, the other terms have different medical meanings. "Purulence" refers specifically to the quality of being pus-filled but does not denote the process itself. "Secretion" generally refers to the act of releasing a substance from cells, typically fluids like hormones, saliva, or mucus, which is different from the context of pus formation. "Infiltration" usually pertains to the penetration of substances into tissues, which can relate to various medical conditions but does not specifically refer to pus formation.